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    <td><p><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Sorry, that is incorrect.</font></p>
      <p><font size="4" face="Verdana, Arial, Helvetica, sans-serif">One or both of the following may be why your answer is incorrect:</font> </p>
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        <li><font size="4" face="Verdana, Arial, Helvetica, sans-serif">You have checked a ratio that would leave extra hydrogen or oxygen around.</font></li>
        <li><font size="4" face="Verdana, Arial, Helvetica, sans-serif">You didn't check one of the ratios that would work.</font></li>
    </ol>      <p><font size="4" face="Verdana, Arial, Helvetica, sans-serif">You can check each of your answers by trying them out using the menu to the left of the model. Be sure to wait long enough for the reaction to reach completion.</font></p></td>
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